Centre for Quantum Photonics, H. H. Wills Physics Laboratory and Department of Electrical and Electronic Engineering, University of Bristol, Bristol BS8 1UB, United Kingdom and MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter and Department of Applied Physics, Xi'an Jiaotong University, Xi'an 710049, China.
Centre for Quantum Photonics, H. H. Wills Physics Laboratory and Department of Electrical and Electronic Engineering, University of Bristol, Bristol BS8 1UB, United Kingdom.
Phys Rev Lett. 2014 Apr 4;112(13):130501. doi: 10.1103/PhysRevLett.112.130501. Epub 2014 Apr 2.
We demonstrate a client-server quantum key distribution (QKD) scheme. Large resources such as laser and detectors are situated at the server side, which is accessible via telecom fiber to a client requiring only an on-chip polarization rotator, which may be integrated into a handheld device. The detrimental effects of unstable fiber birefringence are overcome by employing the reference-frame-independent QKD protocol for polarization qubits in polarization maintaining fiber, where standard QKD protocols fail, as we show for comparison. This opens the way for quantum enhanced secure communications between companies and members of the general public equipped with handheld mobile devices, via telecom-fiber tethering.
我们展示了一种客户端-服务器量子密钥分发（QKD）方案。大量资源，如激光器和探测器，位于服务器端，通过电信光纤与只需一个片上偏振旋转器的客户端相连，该偏振旋转器可集成到手持设备中。在保偏光纤中，采用偏振量子比特的参考系无关 QKD 协议克服了光纤双折射不稳定的有害影响，而在这种光纤中标准 QKD 协议会失败，我们对此进行了比较。这为通过电信光纤连接配备手持式移动设备的公司和公众成员之间进行量子增强安全通信开辟了道路。
